Allow Nowait and lock retry count in PostgreSQL without using savepoints. (#941)

Issue 203358

(cherry picked from commit bec6c12)

Author: iroqueta

java/src/main/java/com/genexus/db/DataStoreProvider.java

@@ -272,9 +272,7 @@ private void execute(int cursorIdx, Object[] parms, boolean preExecute)
 			cursor.status = 0;
 			try
 			{
-				executeSavePointOperation("SAVEPOINT gxselectforupdate", cursor);				
 				cursor.postExecute(this, getDataSource());
-				executeSavePointOperation("RELEASE SAVEPOINT gxselectforupdate", cursor);				
 			}
 			catch (SQLException e)
 			{
@@ -344,7 +342,6 @@ private void execute(int cursorIdx, Object[] parms, boolean preExecute)
 								{
 								}
 							}
-							executeSavePointOperation("ROLLBACK TO SAVEPOINT gxselectforupdate", cursor);
 				    }				    
 				}
 			    retryCount = retryCount + 1;
@@ -430,23 +427,6 @@ private void setParameters(int cursorIdx, Object[] parms, Cursor cursor,
 		}
 	}
 
-	
-	private void executeSavePointOperation(String operation, Cursor cursor) 
-	{
-		if (getDataSource().dbms.getId() == GXDBMS.DBMS_POSTGRESQL && GXutil.dbmsVersion( context, remoteHandle, getDataSource().name) > 7 && cursor instanceof ForEachCursor && cursor.isCurrentOf())
-		{
-	    	try
-	    	{
-	    		SentenceProvider.executeStatement(this, operation);
-	    	}
-	    	catch (Exception ex)
-	    	{
-	    		System.err.println(operation + " error " + ex.getMessage());
-	    		ex.printStackTrace();
-	    	}			
-		}
-	}	
-
 	static Object lock = new Object();
 
 	public void readNext(int cursorIdx)

java/src/main/java/com/genexus/db/DefaultExceptionErrorHandler.java

@@ -29,6 +29,8 @@ public static void handleSQLError(IErrorHandler errorHandler, SQLException e, Mo
 		}	
 		if (!context.inErrorHandler) 
 		{
+			if (e.getCause() != null && e.getCause() instanceof SQLException)
+				e = ((SQLException)e.getCause());
 			if	(errorHandler != null)
 			{
 					context.globals.Gx_err = (short) cursor.status;

java/src/main/java/com/genexus/db/driver/GXDBMSpostgresql.java

@@ -84,9 +84,10 @@ public boolean DuplicateKeyValue(SQLException e)
 	public boolean ObjectLocked(SQLException e)
 	{
 		String sqlstate = e.getSQLState().toLowerCase();
-		if (sqlstate.indexOf("55p03")>=0)
-			return true;
-		return false;
+		String sqlstateCause = "";
+		if (e.getCause() != null && e.getCause() instanceof SQLException)
+			sqlstateCause = ((SQLException)e.getCause()).getSQLState().toLowerCase();
+		return sqlstate.contains("55p03") || sqlstateCause.contains("55p03");
 	}
 
 	public boolean ObjectNotFound(SQLException e)